Question

Who can help me out please I’ll mark brainliest

Answer 1

$7x + 12 = 9x - 6$

$7x + 12 - 7x = 9x - 6 - 7x$

$12 = 2x - 6$

$12 - 6 = 2x -6 - 6$

$6 = 2x - 12$

$6 + 12 = 2x$

$18 = 2x$

$18 \div 2 = x$

$9 = \bold{ x}$

In pythagoras, c is the hypotenuse. That is AC. Where a is AB and b is BC.

${c}^{2} = {a}^{2} + {b}^{2}$

${(6 x + 5)}^{2} = {(7x + 12)}^{2} + {BC}^{2}$

${((6 \times 9) + 5)}^{2} = {((7 \times 9)}^{2} + 12)^{2} +{BC}^{2}$

${(54 + 5)}^{2} = {(63 + 12)}^{2} + {BC}^{2}$

${59}^{2} = {75}^{2} + {BC}^{2}$

$3481 = 5625 + {BC}^{2}$

$3481 - 5625 = {BC}^{2}$

$- 2144 = {BC}^{2}$

$\sqrt{ - 2144} = BC$